Reinforced concrete construction.



H. M. HINCZ.

RExNFoRcEn CONCRETE coNsTRucTmN.

APPLICATION FILED 1ANZ7| i912.

Patented Nom 21, i916.

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H. Ni. HINCZ.

REINFORCED CONCRETE CONSTRUCTION.

APPLICATloN FILED 11111.27. 1912.

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I I-IIPOLIT M. HINCZ, OF CHI-CAGO, ILLINOIS, ASSIGNOR, BY MESNEASSIGNMENTS, TO

PATENTE!) DEVICES COMPANY, -OF PORTLAND, MAINE, A CORPORATION OF MAINE.

REINFORCED CONCRETE CONSTRUCTION.

specificationof Letters Patent. Fiamme@ Nov, 211, 1916,

Application led January 27, 1912. Serial No. 673,793.

T all whom z' may concern Be it known that I, HrroLrr M. HINCZ,

l residing at Chicago, in the county ofj Cook This invention relates togirderless or flatslab floors, roofs and similar structures. In

prior systems of construction,l the metallic reinforcing members havenot been economically distributed within the slab, but on the contrary,lhave been so arranged that in order to obtain sufficient reinforcementin the regions of greatest strain', it has been necessary to use anundueamount of reinforce- It yis an object of this invention to devise anarrangement of the reinforcing members .which shall be consistent withthe d1stribution of stresses in the slab, whereby the metal shall beplaced only where needed, and in amounts which are'properly proportionedto the duty to be performed.

In certain prior constructions, each floor panel has been considered asconsisting of four beams extendingldirectly between columns, witharectangular' slab supported by said beams. Such beams being of longspan, require a' considerable depth of concrete, and therefore if thepanel is to be of uniform thickness its thickness will be determined bythe thickness required for the beams, thus involving an excessive use ofconcrete.

One of the objects of this invention is to design the panel in such amanner that a minimum thickness of concrete may be em ployed.

A further object is to provide, in a system of construction permittingof accurate analysis and determination of stresses, means to transmitthe stresses due to the dead weight of an applied load upon the centralportion of the panel, more nearly directly to the columns than hasheretofore been possible.

One form of construction by means of which the foregoing objects may beattained is illustrated in the accompanying drawings, wherein- 2, 3, 4and 5 are sectional views taken in the respectively, of Fig. l.

For Athe sake of clearness, some of the reinforcing bars are omitted inFig. 5

vIn the drawings, the numeral 1 denotes columns of any suitable orcommon conplanes of dotted lines 2 2, 3 3, 4 ,and 5 5,

struction, and 2 indicates flaring column caps. These caps lmay beomitted in some instances, as when the spans are short.v The columns andcapitals may be reinforced in any preferred manner.

While the floor is herein shown as of monolithic construction, it may beconsidered as made up of a plurality of rectangular panels. Fig. lillustrates two'complete 'floor panels and portions of several other .Yment in other regions, thereby involving" `waste of metal.

panels, each panel being supported -at its corners upon the columns.Each panel is considered as comprising a central rectangular slab; fourbeams arranged in the form of a rectangle surrounding and supportingsaid slab; cantalivers extending diagonally from the columns to thecorners of the rectangle, for supporting said beams; and four wideshallow beams extending directly between columns.

The slab and beams are represented by dot-and-dash lines in thc lowerportion of Fig. l, A being the central slab, B the four beams'that carrysaid slab, C the cantalivers, and D the beams extending directly betweenthe columns.

The slab A may be reinforced in any preferred manner; in this instance Ihave shown a series of bars 3 extending transversely of the slab, and asimilar series of bars 3 crossing the other series at right angles. Inthe present embodiment, each bar 3 extends from a point near the lowerface of one beam B, horizontally through the slab A, thence upwardly andacross the opposite beam B and into the adjacent beam D. The bars 3extend alternately to opposite beams D.

The reinforcing for the beams B may be of any suitable character, butpreferably each of said beams is `reinforced by bars i, as shown inFigs. l, 2 and 3. These bars extend through the tension region of thebeam and thence upwardly and transversely through the upper portion ofanother of the beams B and into' the adjacent beam D.

Each column supports two cantalivers C extending diagonally betweencolumns.`

Titi- Each arm of each cantaliver carries one corner of a rectangleformed by four beams B. ln the structure shown as an example, eachcantaliver is reinforced by a group of bars 5 extending within the upperportion of the ioor slab, with the end portions ofthe bars underlyingthe bars fl at the intersections of the beams B. Preferably, although inot necessarily, the ends of the bars 5 are bent diagonally downwardlyat 5 'to assist in caring for diagonal tension. lf desired,

` the extreme ends 5X-of the bars 5 may be bent upwardly into the formof .hooks to afford additional anchorage forl the bars in the concrete.The bending of the bars 5 as just described a'ords means for supportingsaid bars upon the form-work (not shown) during the process of erection,the downwardly bent portions serving'as gages to space the body of thebars at the desired distance above the formework. No material portion ofthe bars 5 will be exposed upon the under.

side of theslab, when theextreme ends Aof the bars are bent upwardly asshown.

If desired, the middle portions of the bars 5 in one cantaliver may bedeflected or depressed suiiciently to permit both series of.

bars 5 to lie in the same horizontal plane.

Referring now to the beam D: Vhile nthese may be reinforced in variousways,

the reinforcement herein illustrated 'comprises longitudinal bars 6 eachextending from a point in or near the axis of av column,

thence horizontally through tlie tension region of the beam, thenceupwardly and over the opposite column to a point in the adjacent alinedbeam D. Each beam is also reinforced against torsional stresses bytrans-v verse bars (which may, if desired, be exten sions of the bars 3,as herein shown) lying in the upper portions of the beam.

In the completed structure, each beam B' supportsonly one-fourth of theload upon the slab A, together with the load directly above said beam B.The four beams lB deliver the major portion of their loads tothecantalivers C, which in turn deliver the load to the columns. Eachcantaliver armis rela. tively `short and is fully counterbalanced by theload upon the opposite arm. The minimum quantity of metalv and concrete,re'

quired in each cantaliver may be readily def termined, since it ispossible to measure accurately the stresses to be borne bythecantaliver.

` In the embodiment which has been selected for illustration, the panelsare rectangular, and the slab A and the set of beams B are accordinglyrectangular, but it will be understood that the parts maybe of otherforms, and that there may be more or less than four beams B, dependingupon the shape of the panel; also that there may be vmore than one setyof beams such as B.

I claim as my invention:

- 1. A girderless monolithic reinforced-concrete construction consistingof a plurality of columns, ,and a fiat slab of concrete over thecolumns, said columns being located atj the angles of tlie slab, saidsla-b containing reinforcment extending directly from one column toanother and forming beams of ya width exceeding the thickness of theslab,

said'slab comprising a central portion, re-

inforcement extending vin two directions through the central portion,part of the last mentioned reinforcement being extended transversely.through and beyond the beams,

over the columns, said columns being located at the angles of the slab,said panel containing vreinforcement extending directly from one columnto another and forming beams of a width exceeding the thickness of thepanel,

.said panel comprising a central portion, re-

inforcement extending in two directions through said central portion, apart of the last mentioned reinforcement extending transversely throughand beyond the beams, reinforcement within the panel forming four beamslying between the iirst nien-y vtioned beams. and the central portionand carrying they .central portion, the second mentioned beams havingintersecting ends andv forming a rectangle, two groups of reinforcingelements crossing one another above each column and forming cantalivers,

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the outer ends of said groups of reinforcingl elements underlying thereinforcement fory the'second mentioned beams at the corners *of therectangle.

" ,In testimony whereof l'aflix my signature inl presence of twowitnesses;

HIPOLT M. HlNCZ. Tt/'itnesses EARL-C. Canteen. l Gannon L. Ciiiiisairn.

